Root/net/compat.c

1/*
2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
3 *
4 * Copyright (C) 2000 VA Linux Co
5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 2000 Hewlett-Packard Co.
10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
12 */
13
14#include <linux/kernel.h>
15#include <linux/fs.h>
16#include <linux/types.h>
17#include <linux/file.h>
18#include <linux/icmpv6.h>
19#include <linux/socket.h>
20#include <linux/syscalls.h>
21#include <linux/filter.h>
22#include <linux/compat.h>
23#include <linux/security.h>
24
25#include <net/scm.h>
26#include <net/sock.h>
27#include <net/ip.h>
28#include <net/ipv6.h>
29#include <asm/uaccess.h>
30#include <net/compat.h>
31
32static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
33                      struct compat_iovec __user *uiov32,
34                      int niov)
35{
36    int tot_len = 0;
37
38    while (niov > 0) {
39        compat_uptr_t buf;
40        compat_size_t len;
41
42        if (get_user(len, &uiov32->iov_len) ||
43           get_user(buf, &uiov32->iov_base)) {
44            tot_len = -EFAULT;
45            break;
46        }
47        tot_len += len;
48        kiov->iov_base = compat_ptr(buf);
49        kiov->iov_len = (__kernel_size_t) len;
50        uiov32++;
51        kiov++;
52        niov--;
53    }
54    return tot_len;
55}
56
57int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
58{
59    compat_uptr_t tmp1, tmp2, tmp3;
60
61    if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
62        __get_user(tmp1, &umsg->msg_name) ||
63        __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
64        __get_user(tmp2, &umsg->msg_iov) ||
65        __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
66        __get_user(tmp3, &umsg->msg_control) ||
67        __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
68        __get_user(kmsg->msg_flags, &umsg->msg_flags))
69        return -EFAULT;
70    kmsg->msg_name = compat_ptr(tmp1);
71    kmsg->msg_iov = compat_ptr(tmp2);
72    kmsg->msg_control = compat_ptr(tmp3);
73    return 0;
74}
75
76/* I've named the args so it is easy to tell whose space the pointers are in. */
77int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
78           struct sockaddr *kern_address, int mode)
79{
80    int tot_len;
81
82    if (kern_msg->msg_namelen) {
83        if (mode==VERIFY_READ) {
84            int err = move_addr_to_kernel(kern_msg->msg_name,
85                              kern_msg->msg_namelen,
86                              kern_address);
87            if (err < 0)
88                return err;
89        }
90        kern_msg->msg_name = kern_address;
91    } else
92        kern_msg->msg_name = NULL;
93
94    tot_len = iov_from_user_compat_to_kern(kern_iov,
95                      (struct compat_iovec __user *)kern_msg->msg_iov,
96                      kern_msg->msg_iovlen);
97    if (tot_len >= 0)
98        kern_msg->msg_iov = kern_iov;
99
100    return tot_len;
101}
102
103/* Bleech... */
104#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
105
106#define CMSG_COMPAT_DATA(cmsg) \
107    ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
108#define CMSG_COMPAT_SPACE(len) \
109    (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
110#define CMSG_COMPAT_LEN(len) \
111    (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
112
113#define CMSG_COMPAT_FIRSTHDR(msg) \
114    (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
115     (struct compat_cmsghdr __user *)((msg)->msg_control) : \
116     (struct compat_cmsghdr __user *)NULL)
117
118#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
119    ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
120     (ucmlen) <= (unsigned long) \
121     ((mhdr)->msg_controllen - \
122      ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
123
124static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
125        struct compat_cmsghdr __user *cmsg, int cmsg_len)
126{
127    char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
128    if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
129            msg->msg_controllen)
130        return NULL;
131    return (struct compat_cmsghdr __user *)ptr;
132}
133
134/* There is a lot of hair here because the alignment rules (and
135 * thus placement) of cmsg headers and length are different for
136 * 32-bit apps. -DaveM
137 */
138int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
139                   unsigned char *stackbuf, int stackbuf_size)
140{
141    struct compat_cmsghdr __user *ucmsg;
142    struct cmsghdr *kcmsg, *kcmsg_base;
143    compat_size_t ucmlen;
144    __kernel_size_t kcmlen, tmp;
145    int err = -EFAULT;
146
147    kcmlen = 0;
148    kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
149    ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
150    while (ucmsg != NULL) {
151        if (get_user(ucmlen, &ucmsg->cmsg_len))
152            return -EFAULT;
153
154        /* Catch bogons. */
155        if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
156            return -EINVAL;
157
158        tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
159               CMSG_ALIGN(sizeof(struct cmsghdr)));
160        tmp = CMSG_ALIGN(tmp);
161        kcmlen += tmp;
162        ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
163    }
164    if (kcmlen == 0)
165        return -EINVAL;
166
167    /* The kcmlen holds the 64-bit version of the control length.
168     * It may not be modified as we do not stick it into the kmsg
169     * until we have successfully copied over all of the data
170     * from the user.
171     */
172    if (kcmlen > stackbuf_size)
173        kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
174    if (kcmsg == NULL)
175        return -ENOBUFS;
176
177    /* Now copy them over neatly. */
178    memset(kcmsg, 0, kcmlen);
179    ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
180    while (ucmsg != NULL) {
181        if (__get_user(ucmlen, &ucmsg->cmsg_len))
182            goto Efault;
183        if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
184            goto Einval;
185        tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
186               CMSG_ALIGN(sizeof(struct cmsghdr)));
187        if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
188            goto Einval;
189        kcmsg->cmsg_len = tmp;
190        tmp = CMSG_ALIGN(tmp);
191        if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
192            __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
193            copy_from_user(CMSG_DATA(kcmsg),
194                   CMSG_COMPAT_DATA(ucmsg),
195                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
196            goto Efault;
197
198        /* Advance. */
199        kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
200        ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
201    }
202
203    /* Ok, looks like we made it. Hook it up and return success. */
204    kmsg->msg_control = kcmsg_base;
205    kmsg->msg_controllen = kcmlen;
206    return 0;
207
208Einval:
209    err = -EINVAL;
210Efault:
211    if (kcmsg_base != (struct cmsghdr *)stackbuf)
212        sock_kfree_s(sk, kcmsg_base, kcmlen);
213    return err;
214}
215
216int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
217{
218    struct compat_timeval ctv;
219    struct compat_timespec cts[3];
220    struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
221    struct compat_cmsghdr cmhdr;
222    int cmlen;
223
224    if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
225        kmsg->msg_flags |= MSG_CTRUNC;
226        return 0; /* XXX: return error? check spec. */
227    }
228
229    if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
230        struct timeval *tv = (struct timeval *)data;
231        ctv.tv_sec = tv->tv_sec;
232        ctv.tv_usec = tv->tv_usec;
233        data = &ctv;
234        len = sizeof(ctv);
235    }
236    if (level == SOL_SOCKET &&
237        (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
238        int count = type == SCM_TIMESTAMPNS ? 1 : 3;
239        int i;
240        struct timespec *ts = (struct timespec *)data;
241        for (i = 0; i < count; i++) {
242            cts[i].tv_sec = ts[i].tv_sec;
243            cts[i].tv_nsec = ts[i].tv_nsec;
244        }
245        data = &cts;
246        len = sizeof(cts[0]) * count;
247    }
248
249    cmlen = CMSG_COMPAT_LEN(len);
250    if (kmsg->msg_controllen < cmlen) {
251        kmsg->msg_flags |= MSG_CTRUNC;
252        cmlen = kmsg->msg_controllen;
253    }
254    cmhdr.cmsg_level = level;
255    cmhdr.cmsg_type = type;
256    cmhdr.cmsg_len = cmlen;
257
258    if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
259        return -EFAULT;
260    if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
261        return -EFAULT;
262    cmlen = CMSG_COMPAT_SPACE(len);
263    if (kmsg->msg_controllen < cmlen)
264        cmlen = kmsg->msg_controllen;
265    kmsg->msg_control += cmlen;
266    kmsg->msg_controllen -= cmlen;
267    return 0;
268}
269
270void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
271{
272    struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
273    int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
274    int fdnum = scm->fp->count;
275    struct file **fp = scm->fp->fp;
276    int __user *cmfptr;
277    int err = 0, i;
278
279    if (fdnum < fdmax)
280        fdmax = fdnum;
281
282    for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
283        int new_fd;
284        err = security_file_receive(fp[i]);
285        if (err)
286            break;
287        err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
288                      ? O_CLOEXEC : 0);
289        if (err < 0)
290            break;
291        new_fd = err;
292        err = put_user(new_fd, cmfptr);
293        if (err) {
294            put_unused_fd(new_fd);
295            break;
296        }
297        /* Bump the usage count and install the file. */
298        get_file(fp[i]);
299        fd_install(new_fd, fp[i]);
300    }
301
302    if (i > 0) {
303        int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
304        err = put_user(SOL_SOCKET, &cm->cmsg_level);
305        if (!err)
306            err = put_user(SCM_RIGHTS, &cm->cmsg_type);
307        if (!err)
308            err = put_user(cmlen, &cm->cmsg_len);
309        if (!err) {
310            cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
311            kmsg->msg_control += cmlen;
312            kmsg->msg_controllen -= cmlen;
313        }
314    }
315    if (i < fdnum)
316        kmsg->msg_flags |= MSG_CTRUNC;
317
318    /*
319     * All of the files that fit in the message have had their
320     * usage counts incremented, so we just free the list.
321     */
322    __scm_destroy(scm);
323}
324
325/*
326 * A struct sock_filter is architecture independent.
327 */
328struct compat_sock_fprog {
329    u16 len;
330    compat_uptr_t filter; /* struct sock_filter * */
331};
332
333static int do_set_attach_filter(struct socket *sock, int level, int optname,
334                char __user *optval, unsigned int optlen)
335{
336    struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
337    struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
338    compat_uptr_t ptr;
339    u16 len;
340
341    if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
342        !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
343        __get_user(len, &fprog32->len) ||
344        __get_user(ptr, &fprog32->filter) ||
345        __put_user(len, &kfprog->len) ||
346        __put_user(compat_ptr(ptr), &kfprog->filter))
347        return -EFAULT;
348
349    return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
350                  sizeof(struct sock_fprog));
351}
352
353static int do_set_sock_timeout(struct socket *sock, int level,
354        int optname, char __user *optval, unsigned int optlen)
355{
356    struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
357    struct timeval ktime;
358    mm_segment_t old_fs;
359    int err;
360
361    if (optlen < sizeof(*up))
362        return -EINVAL;
363    if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
364        __get_user(ktime.tv_sec, &up->tv_sec) ||
365        __get_user(ktime.tv_usec, &up->tv_usec))
366        return -EFAULT;
367    old_fs = get_fs();
368    set_fs(KERNEL_DS);
369    err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
370    set_fs(old_fs);
371
372    return err;
373}
374
375static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
376                char __user *optval, unsigned int optlen)
377{
378    if (optname == SO_ATTACH_FILTER)
379        return do_set_attach_filter(sock, level, optname,
380                        optval, optlen);
381    if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
382        return do_set_sock_timeout(sock, level, optname, optval, optlen);
383
384    return sock_setsockopt(sock, level, optname, optval, optlen);
385}
386
387asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
388                char __user *optval, unsigned int optlen)
389{
390    int err;
391    struct socket *sock;
392
393    if (optlen < 0)
394        return -EINVAL;
395
396    if ((sock = sockfd_lookup(fd, &err))!=NULL)
397    {
398        err = security_socket_setsockopt(sock,level,optname);
399        if (err) {
400            sockfd_put(sock);
401            return err;
402        }
403
404        if (level == SOL_SOCKET)
405            err = compat_sock_setsockopt(sock, level,
406                    optname, optval, optlen);
407        else if (sock->ops->compat_setsockopt)
408            err = sock->ops->compat_setsockopt(sock, level,
409                    optname, optval, optlen);
410        else
411            err = sock->ops->setsockopt(sock, level,
412                    optname, optval, optlen);
413        sockfd_put(sock);
414    }
415    return err;
416}
417
418static int do_get_sock_timeout(struct socket *sock, int level, int optname,
419        char __user *optval, int __user *optlen)
420{
421    struct compat_timeval __user *up;
422    struct timeval ktime;
423    mm_segment_t old_fs;
424    int len, err;
425
426    up = (struct compat_timeval __user *) optval;
427    if (get_user(len, optlen))
428        return -EFAULT;
429    if (len < sizeof(*up))
430        return -EINVAL;
431    len = sizeof(ktime);
432    old_fs = get_fs();
433    set_fs(KERNEL_DS);
434    err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
435    set_fs(old_fs);
436
437    if (!err) {
438        if (put_user(sizeof(*up), optlen) ||
439            !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
440            __put_user(ktime.tv_sec, &up->tv_sec) ||
441            __put_user(ktime.tv_usec, &up->tv_usec))
442            err = -EFAULT;
443    }
444    return err;
445}
446
447static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
448                char __user *optval, int __user *optlen)
449{
450    if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
451        return do_get_sock_timeout(sock, level, optname, optval, optlen);
452    return sock_getsockopt(sock, level, optname, optval, optlen);
453}
454
455int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
456{
457    struct compat_timeval __user *ctv =
458            (struct compat_timeval __user*) userstamp;
459    int err = -ENOENT;
460    struct timeval tv;
461
462    if (!sock_flag(sk, SOCK_TIMESTAMP))
463        sock_enable_timestamp(sk, SOCK_TIMESTAMP);
464    tv = ktime_to_timeval(sk->sk_stamp);
465    if (tv.tv_sec == -1)
466        return err;
467    if (tv.tv_sec == 0) {
468        sk->sk_stamp = ktime_get_real();
469        tv = ktime_to_timeval(sk->sk_stamp);
470    }
471    err = 0;
472    if (put_user(tv.tv_sec, &ctv->tv_sec) ||
473            put_user(tv.tv_usec, &ctv->tv_usec))
474        err = -EFAULT;
475    return err;
476}
477EXPORT_SYMBOL(compat_sock_get_timestamp);
478
479int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
480{
481    struct compat_timespec __user *ctv =
482            (struct compat_timespec __user*) userstamp;
483    int err = -ENOENT;
484    struct timespec ts;
485
486    if (!sock_flag(sk, SOCK_TIMESTAMP))
487        sock_enable_timestamp(sk, SOCK_TIMESTAMP);
488    ts = ktime_to_timespec(sk->sk_stamp);
489    if (ts.tv_sec == -1)
490        return err;
491    if (ts.tv_sec == 0) {
492        sk->sk_stamp = ktime_get_real();
493        ts = ktime_to_timespec(sk->sk_stamp);
494    }
495    err = 0;
496    if (put_user(ts.tv_sec, &ctv->tv_sec) ||
497            put_user(ts.tv_nsec, &ctv->tv_nsec))
498        err = -EFAULT;
499    return err;
500}
501EXPORT_SYMBOL(compat_sock_get_timestampns);
502
503asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
504                char __user *optval, int __user *optlen)
505{
506    int err;
507    struct socket *sock;
508
509    if ((sock = sockfd_lookup(fd, &err))!=NULL)
510    {
511        err = security_socket_getsockopt(sock, level,
512                               optname);
513        if (err) {
514            sockfd_put(sock);
515            return err;
516        }
517
518        if (level == SOL_SOCKET)
519            err = compat_sock_getsockopt(sock, level,
520                    optname, optval, optlen);
521        else if (sock->ops->compat_getsockopt)
522            err = sock->ops->compat_getsockopt(sock, level,
523                    optname, optval, optlen);
524        else
525            err = sock->ops->getsockopt(sock, level,
526                    optname, optval, optlen);
527        sockfd_put(sock);
528    }
529    return err;
530}
531
532struct compat_group_req {
533    __u32 gr_interface;
534    struct __kernel_sockaddr_storage gr_group
535        __attribute__ ((aligned(4)));
536} __attribute__ ((packed));
537
538struct compat_group_source_req {
539    __u32 gsr_interface;
540    struct __kernel_sockaddr_storage gsr_group
541        __attribute__ ((aligned(4)));
542    struct __kernel_sockaddr_storage gsr_source
543        __attribute__ ((aligned(4)));
544} __attribute__ ((packed));
545
546struct compat_group_filter {
547    __u32 gf_interface;
548    struct __kernel_sockaddr_storage gf_group
549        __attribute__ ((aligned(4)));
550    __u32 gf_fmode;
551    __u32 gf_numsrc;
552    struct __kernel_sockaddr_storage gf_slist[1]
553        __attribute__ ((aligned(4)));
554} __attribute__ ((packed));
555
556#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
557            sizeof(struct __kernel_sockaddr_storage))
558
559
560int compat_mc_setsockopt(struct sock *sock, int level, int optname,
561    char __user *optval, unsigned int optlen,
562    int (*setsockopt)(struct sock *,int,int,char __user *,unsigned int))
563{
564    char __user *koptval = optval;
565    int koptlen = optlen;
566
567    switch (optname) {
568    case MCAST_JOIN_GROUP:
569    case MCAST_LEAVE_GROUP:
570    {
571        struct compat_group_req __user *gr32 = (void *)optval;
572        struct group_req __user *kgr =
573            compat_alloc_user_space(sizeof(struct group_req));
574        u32 interface;
575
576        if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
577            !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
578            __get_user(interface, &gr32->gr_interface) ||
579            __put_user(interface, &kgr->gr_interface) ||
580            copy_in_user(&kgr->gr_group, &gr32->gr_group,
581                sizeof(kgr->gr_group)))
582            return -EFAULT;
583        koptval = (char __user *)kgr;
584        koptlen = sizeof(struct group_req);
585        break;
586    }
587    case MCAST_JOIN_SOURCE_GROUP:
588    case MCAST_LEAVE_SOURCE_GROUP:
589    case MCAST_BLOCK_SOURCE:
590    case MCAST_UNBLOCK_SOURCE:
591    {
592        struct compat_group_source_req __user *gsr32 = (void *)optval;
593        struct group_source_req __user *kgsr = compat_alloc_user_space(
594            sizeof(struct group_source_req));
595        u32 interface;
596
597        if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
598            !access_ok(VERIFY_WRITE, kgsr,
599            sizeof(struct group_source_req)) ||
600            __get_user(interface, &gsr32->gsr_interface) ||
601            __put_user(interface, &kgsr->gsr_interface) ||
602            copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
603                sizeof(kgsr->gsr_group)) ||
604            copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
605                sizeof(kgsr->gsr_source)))
606            return -EFAULT;
607        koptval = (char __user *)kgsr;
608        koptlen = sizeof(struct group_source_req);
609        break;
610    }
611    case MCAST_MSFILTER:
612    {
613        struct compat_group_filter __user *gf32 = (void *)optval;
614        struct group_filter __user *kgf;
615        u32 interface, fmode, numsrc;
616
617        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
618            __get_user(interface, &gf32->gf_interface) ||
619            __get_user(fmode, &gf32->gf_fmode) ||
620            __get_user(numsrc, &gf32->gf_numsrc))
621            return -EFAULT;
622        koptlen = optlen + sizeof(struct group_filter) -
623                sizeof(struct compat_group_filter);
624        if (koptlen < GROUP_FILTER_SIZE(numsrc))
625            return -EINVAL;
626        kgf = compat_alloc_user_space(koptlen);
627        if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
628            __put_user(interface, &kgf->gf_interface) ||
629            __put_user(fmode, &kgf->gf_fmode) ||
630            __put_user(numsrc, &kgf->gf_numsrc) ||
631            copy_in_user(&kgf->gf_group, &gf32->gf_group,
632                sizeof(kgf->gf_group)) ||
633            (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
634                numsrc * sizeof(kgf->gf_slist[0]))))
635            return -EFAULT;
636        koptval = (char __user *)kgf;
637        break;
638    }
639
640    default:
641        break;
642    }
643    return setsockopt(sock, level, optname, koptval, koptlen);
644}
645
646EXPORT_SYMBOL(compat_mc_setsockopt);
647
648int compat_mc_getsockopt(struct sock *sock, int level, int optname,
649    char __user *optval, int __user *optlen,
650    int (*getsockopt)(struct sock *,int,int,char __user *,int __user *))
651{
652    struct compat_group_filter __user *gf32 = (void *)optval;
653    struct group_filter __user *kgf;
654    int __user *koptlen;
655    u32 interface, fmode, numsrc;
656    int klen, ulen, err;
657
658    if (optname != MCAST_MSFILTER)
659        return getsockopt(sock, level, optname, optval, optlen);
660
661    koptlen = compat_alloc_user_space(sizeof(*koptlen));
662    if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
663        __get_user(ulen, optlen))
664        return -EFAULT;
665
666    /* adjust len for pad */
667    klen = ulen + sizeof(*kgf) - sizeof(*gf32);
668
669    if (klen < GROUP_FILTER_SIZE(0))
670        return -EINVAL;
671
672    if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
673        __put_user(klen, koptlen))
674        return -EFAULT;
675
676    /* have to allow space for previous compat_alloc_user_space, too */
677    kgf = compat_alloc_user_space(klen+sizeof(*optlen));
678
679    if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
680        __get_user(interface, &gf32->gf_interface) ||
681        __get_user(fmode, &gf32->gf_fmode) ||
682        __get_user(numsrc, &gf32->gf_numsrc) ||
683        __put_user(interface, &kgf->gf_interface) ||
684        __put_user(fmode, &kgf->gf_fmode) ||
685        __put_user(numsrc, &kgf->gf_numsrc) ||
686        copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group)))
687        return -EFAULT;
688
689    err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
690    if (err)
691        return err;
692
693    if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
694        __get_user(klen, koptlen))
695        return -EFAULT;
696
697    ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
698
699    if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
700        __put_user(ulen, optlen))
701        return -EFAULT;
702
703    if (!access_ok(VERIFY_READ, kgf, klen) ||
704        !access_ok(VERIFY_WRITE, gf32, ulen) ||
705        __get_user(interface, &kgf->gf_interface) ||
706        __get_user(fmode, &kgf->gf_fmode) ||
707        __get_user(numsrc, &kgf->gf_numsrc) ||
708        __put_user(interface, &gf32->gf_interface) ||
709        __put_user(fmode, &gf32->gf_fmode) ||
710        __put_user(numsrc, &gf32->gf_numsrc))
711        return -EFAULT;
712    if (numsrc) {
713        int copylen;
714
715        klen -= GROUP_FILTER_SIZE(0);
716        copylen = numsrc * sizeof(gf32->gf_slist[0]);
717        if (copylen > klen)
718            copylen = klen;
719            if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
720            return -EFAULT;
721    }
722    return err;
723}
724
725EXPORT_SYMBOL(compat_mc_getsockopt);
726
727
728/* Argument list sizes for compat_sys_socketcall */
729#define AL(x) ((x) * sizeof(u32))
730static unsigned char nas[19]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
731                AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
732                AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
733                AL(4)};
734#undef AL
735
736asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
737{
738    return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
739}
740
741asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
742{
743    return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
744}
745
746asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned flags)
747{
748    return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
749}
750
751asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
752                    unsigned flags, struct sockaddr __user *addr,
753                    int __user *addrlen)
754{
755    return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
756}
757
758asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
759{
760    int ret;
761    u32 a[6];
762    u32 a0, a1;
763
764    if (call < SYS_SOCKET || call > SYS_ACCEPT4)
765        return -EINVAL;
766    if (copy_from_user(a, args, nas[call]))
767        return -EFAULT;
768    a0 = a[0];
769    a1 = a[1];
770
771    switch (call) {
772    case SYS_SOCKET:
773        ret = sys_socket(a0, a1, a[2]);
774        break;
775    case SYS_BIND:
776        ret = sys_bind(a0, compat_ptr(a1), a[2]);
777        break;
778    case SYS_CONNECT:
779        ret = sys_connect(a0, compat_ptr(a1), a[2]);
780        break;
781    case SYS_LISTEN:
782        ret = sys_listen(a0, a1);
783        break;
784    case SYS_ACCEPT:
785        ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
786        break;
787    case SYS_GETSOCKNAME:
788        ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
789        break;
790    case SYS_GETPEERNAME:
791        ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
792        break;
793    case SYS_SOCKETPAIR:
794        ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
795        break;
796    case SYS_SEND:
797        ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
798        break;
799    case SYS_SENDTO:
800        ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
801        break;
802    case SYS_RECV:
803        ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
804        break;
805    case SYS_RECVFROM:
806        ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
807                      compat_ptr(a[4]), compat_ptr(a[5]));
808        break;
809    case SYS_SHUTDOWN:
810        ret = sys_shutdown(a0,a1);
811        break;
812    case SYS_SETSOCKOPT:
813        ret = compat_sys_setsockopt(a0, a1, a[2],
814                compat_ptr(a[3]), a[4]);
815        break;
816    case SYS_GETSOCKOPT:
817        ret = compat_sys_getsockopt(a0, a1, a[2],
818                compat_ptr(a[3]), compat_ptr(a[4]));
819        break;
820    case SYS_SENDMSG:
821        ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
822        break;
823    case SYS_RECVMSG:
824        ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
825        break;
826    case SYS_ACCEPT4:
827        ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
828        break;
829    default:
830        ret = -EINVAL;
831        break;
832    }
833    return ret;
834}
835

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